| Full text | |
| Author(s): Show less - |
Covre, F. S.
;
Faria, P. E., Jr.
;
Gordo, V. O.
;
de Brito, C. Serati
;
Zhumagulov, Y., V
;
Teodoro, M. D.
;
Couto, O. D. D., Jr.
;
Misoguti, L.
;
Pratavieira, S.
;
Andrade, M. B.
;
Christianen, P. C. M.
;
Fabian, J.
;
Withers, F.
;
Gobato, Y. Galvao
Total Authors: 14
|
| Document type: | Journal article |
| Source: | NANOSCALE; v. 14, n. 15, p. 11-pg., 2022-03-22. |
| Abstract | |
Strain plays an important role for the optical properties of monolayer transition metal dichalcogenides (TMDCs). Here, we investigate strain effects in a monolayer MoSe2 sample with a large bubble region using mu-Raman, second harmonic generation (SHG), mu-photoluminescence and magneto mu-photoluminescence at low temperature. Remarkably, our results reveal the presence of a non-uniform strain field and the observation of emission peaks at lower energies which are the signatures of exciton and trion quasiparticles red-shifted by strain effects in the bubble region, in agreement with our theoretical predictions. Furthermore, we have observed that the emission in the strained region decreases the trion binding energy and enhances the valley g-factors as compared to non-strained regions. Considering uniform biaxial strain effects within the unit cell of the TMDC monolayer (ML), our first principles calculations predict the observed enhancement of the exciton valley Zeeman effect. In addition, our results suggest that the exciton-trion fine structure plays an important role for the optical properties of strained TMDC ML. In summary, our study provides fundamental insights on the behaviour of excitons and trions in strained monolayer MoSe2 which are particularly relevant to properly characterize and understand the fine structure of excitonic complexes in strained TMDC systems/devices. (AU) | |
| FAPESP's process: | 14/19142-2 - Characterization and processing of semiconductor nanostructures and application as devices |
| Grantee: | Gilmar Eugenio Marques |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/01808-5 - Optical and Transport Properties in High Magnetic Fields of Semiconductor Heterostructures and Devices based on Two Dimensional Materials |
| Grantee: | Yara Galvão Gobato |
| Support Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 19/23488-5 - 2D devices for optoeletronics |
| Grantee: | Yara Galvão Gobato |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/18719-1 - Electronic carriers dynamics in semiconductor nanostructures |
| Grantee: | Marcio Daldin Teodoro |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 09/54035-4 - Facility for advanced studies of biosystems and nanostructured materials |
| Grantee: | Igor Polikarpov |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 12/11382-9 - Optical modulation of semiconductor nanostructures using surface acoustic waves |
| Grantee: | Odilon Divino Damasceno Couto Júnior |
| Support Opportunities: | Research Grants - Young Investigators Grants |